db845c: Add usbmisc support

Add usbmisc support to db845c.

This is needed for creating proper cdc-wdm files in /dev for
hardware like USB QMI discrete modems which use the standard
kernel driver (qmi_wwan).

A similar change is already available for the Hikey.

Test: tested with a qmi based modem (Telit FN980)
Change-Id: Ifcf88e101e5d115c7e810d2467471212a58f6cf3
diff --git a/ueventd.common.rc b/ueventd.common.rc
index b87dccf..c0ba022 100644
--- a/ueventd.common.rc
+++ b/ueventd.common.rc
@@ -1,5 +1,8 @@
 modalias_handling enabled
 
+subsystem usbmisc
+    devname uevent_devname
+
 /dev/sw_sync              0660   root       graphics
 
 # gpu